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首页> 外文期刊>Meteoritics & planetary science >Ultra-reduced phases in Apollo 16 regolith: Combined field emission electron probe microanalysis and atom probe tomography of submicron Fe-Si grains in Apollo 16 sample 61500
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Ultra-reduced phases in Apollo 16 regolith: Combined field emission electron probe microanalysis and atom probe tomography of submicron Fe-Si grains in Apollo 16 sample 61500

机译：Apollo 16术中的超减少阶段：Apollo 16样品亚微米Fe-Si谷物的组合现场发射电子探针微显和原子探测断层扫描。61500

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The lunar regolith contains a variety of chemically reduced phases of interest to planetary scientists and the most common, metallic iron, is generally ascribed to space weathering processes (Lucey etal. ). Reports of silicon metal and iron silicides, phases indicative of extremely reducing conditions, in lunar samples are rare (Anand etal. ; Spicuzza etal. ). Additional examples of Fe-silicides have been identified in a survey of particles from Apollo 16 sample 61501,22. Herein is demonstrated the utility of low keV electron probe microanalysis (EPMA), using the Fe Ll X-ray line, to analyze these submicron phases, and the necessity of accounting for carbon contamination. We document four Fe-Si and Si-0 minerals in lunar regolith return material. The new Fe-Si samples have a composition close to (Fe,Ni)(3)Si, whereas those associated with Si-0 are close to FeSi2 and Fe3Si7. Atom probe tomography of (Fe,Ni)(3)Si shows trace levels of C (60ppma and nanodomains enriched in C, Ni, P, Cr, and Sr). These reduced minerals require orders of magnitude lower oxygen fugacity and more reducing conditions than required to form Fe-0. Documenting the similarities and differences in these samples is important to constrain their formation processes. These phases potentially formed at high temperatures resulting from a meteorite impact. Whether carbon played a role in achieving the lower oxygen fugacitiesand there is evidence of nearby carbonaceous chondritic materialit remains to be proven that carbon was the necessary component for the unique existence of these Si-0 and iron silicide minerals.
机译：月球重新旋转含有对行星科学家和最常见的金属铁的各种化学减少的阶段，通常归因于空气风化过程（Lucey Etial。）。硅和铁硅化物的报道，在月球样品中指示极其还原条件的阶段是罕见的（AnAnteTeal。; Spicuzza等）。已经在来自Apollo 16样品61501,22的颗粒的调查中鉴定了Fe-硅化物的另外的实施例。本文证明了使用Fe LL X射线线的低keV电子探针微分析（EPMA）的效用，分析这些亚微米相，以及核算碳污染的必要性。我们在月球重新旋转回报材料中记录四种Fe-Si和Si-0矿物质。新的Fe-Si样品具有接近（Fe，Ni）（3）Si的组合物，而与Si-0相关的组合物接近FeSi2和Fe3Si7。 （Fe，Ni）（3）Si的原子探测断层扫描术显示痕量C（富含C，Ni，P，Cr和Sr）的C（60ppma和纳米染色物）。这些降低的矿物质需要较大的氧气逃逸度和比形成Fe-0所需的更低的条件更低的顺序。记录这些样本中的相似性和差异对于约束其形成过程非常重要。这些相可能形成由陨石撞击产生的高温。碳是否在实现较低的氧气逃亡者中发挥作用，存在附近的碳质心脏材料的证据仍有待证明碳是这些Si-0和铁硅化物矿物的独特存在的必要组分。

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